spark-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Davies Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-14785) Support correlated scalar subquery
Date Mon, 02 May 2016 23:34:12 GMT

     [ https://issues.apache.org/jira/browse/SPARK-14785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Davies Liu updated SPARK-14785:
-------------------------------
    Assignee: Herman van Hovell

> Support correlated scalar subquery
> ----------------------------------
>
>                 Key: SPARK-14785
>                 URL: https://issues.apache.org/jira/browse/SPARK-14785
>             Project: Spark
>          Issue Type: New Feature
>            Reporter: Davies Liu
>            Assignee: Herman van Hovell
>             Fix For: 2.0.0
>
>
> For example:
> {code}
> SELECT a from t where b > (select avg(c) from t2 where t.id = t2.id)
> {code}
> it could be rewritten as 
> {code}
> SELECT a FROM t JOIN (SELECT id, AVG(c) as avg_c FROM t2 GROUP by id) t3 ON t3.id = t.id
where b > avg_c
> {code}
> TPCDS Q92, Q81, Q6 required this
> Update: TPCDS Q1 and Q30 also require correlated scalar subquery support.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org


Mime
View raw message